Carbureter.



C. M. STROUD. CARBURETER.

APPLIUATION FILED Juan, 1910.

iygo Patented Nov. 19, i912.

. @www l CHARLES IMI.- BTBOUD, 0F MINNEAPOLIS, MININEBOTA CABBUBETEB.

` Specification of Letters Patent.

Patented Nov. 19, 1912..

Application lcd January 17, 1910. Serial No. 538,484.

To all whom it ma/y concern:

Be it mown that l, CHARLES M. STnoUn, of Minneapolis, Hennepin county,Minnesota, have invented-certain new and useful Improvements inCarbureterxaof which the following is a specilication. My inventionrelates to carbureters and particularly a self-priming one. lncarbureters as usualiy constructed, it is necessary, particularly incold weather, to operate the valve by hand to feed some gasolene intothe mixing chamber for the purpose of priming it. Sometimes it isnecessa vto drop gasolene into the cylinder or cylinders before theengine can be started.

'lhe object of my present invention 1s to maintain, while the engine isat rest, a pool of gasolene in the vaporizing chamber to the end thatthe engine can be easily and quickly started,

A further ob'ect is' to provide a construction which will permit air tobe drawn in from all sides and thoroughly mixed with the gasolenepreparatory to entering the engine cylinder.

The invention consists generally in a carbureting vaporizing chamberhaving means for retaining a pool of oil therein contiguous to the airinletv ports.

Further the invention consists in providing a series of air inlet portsaround the vaporizing chamber.

In the accompanying drawings forming part of this specification, Figure1 is a vertical sectional view of a carburetenembodying my invention,Fig. 2 is a horizontal sectional view on the line of Fig. 1, Fig. 3 is aside elevation, Fig. 4 is a modified construction illustrating the airinlet ports arran ed tangentially with respect to the axis ont tievaporizing chamber.

ln the drawing, 2 represents an. oil reservoir having a supply opening 3and a oati controlling a valve 5 1n the usual way.

6 is an oil passage leading fromthe reservoir and '7 is a portcommunicating with said passage and with the vaporizing cham- Y ber 8.ln the bottom of this chamber-,is a

depression 9 wherein a pool of the oil'may collect upon entering thechamber through the port 7, the oil inthe pool being maintained on alevel with the oil in the reservoir? A needle valve 10 controls the en-ltrance of oil from the passage 6 into the vaporizin chamber. This valveis adjusted to admit t e desired amount of oil from the reservoir, theadjustment being varied according to the temperature, as usual indevices of this kind. An annular wall l1 incloses the vaporizing chamberand has a .series of radial air passages 12 therein leadmg from the opena1r into said chamber, and within said chamber and depending below saidair passages and preferably to a point within the oil in the pool orcontiguous thereto is a fla e 13 inclosin a passage 14 through which t emixture ows to a passage 15 leading to the cylinder. This -passage 15 isprovided with the usual valve 16 and opposite this valve an auxiliaryair in take valve 17 is preferably provided. A pipe 18 is connected withthe cylinder in the usual way and when the engine is in operation, asuction will be established through the passages 14 and l5 and currentsof air will be drawn in through the passages l2. These currents of air,entering the annular passage, formed between the flange 13 and the Wallof the va orizing chamber, will flow downwardly t erein and, contactingwith the pool of oil, will be thoroughly carbureted. If the lower edgeof the flange is out of contact with the oil in the pool, then the airwill flow over the surface of the oil,

but if the lower edge of the flange is immersed in the oil, then thecurrents of air will pass down through the oil and under the flange,emerging in the passage 14. As fast as the oil in the pool is taken u afresh supply will enter through the port and in practice I have foundthat the vaporization isn so rapid that the supply in the pool will begathered up engine and w1ll only accumulate when the engine is at rest.When the engine stops, a pool of the oil will collect in the bottom ofthe vaporizing chamber and be presentcontiguous to the air passages'forimmediate vaporization as soon as the engine is started. N o time is,therefore, required for priming or introducing oil to the cylinders.

The location of the series of passages` around the chamber insures theentrance of a large volume of air to the vaporizing chamber and anabundant supply of the mixture to the enginef The introduction of airfrom all sides of the vaporizing chamber insures a more thorough mixturethan @would be possible with air inlet ports as usuall; arranged. Theiiange coperatingwllo with t e walls of the chamber forms a duct,usually annular, extending around the chaminstantly uponl starting theullo:

' ing currents ture of the oil and ber and communicating with the airintake openings, the walls of the duct serving to direct the currents ofair' downwardly into contact with the pool of oil in the bottom of thechamber.

In Fig. 4 I have illustrated a modified construction, which consists inprovldmg air passages 2O tangentially arranged with respect to the axisof the vaporlzmg chamber. The operation, however, stantially the same asdescribed, the currents of air ent'ering the passages, strikin the wallof the flange 14 and bemgdeflecte downwardly thereby into the pool ofoil beneath. l

I do not, in this application, wish to be confined to the specificarrangement or construction oflparts shown herein, as I am aware thatthe vaporizing chamber and the air inlet ports may be modified invariousv ways and still be within the scope of my invention.

I claim as my invention: 1. A carbureter comprising a casing havavaporizing chamber and an oil reser- 1n Voir provided with an overflowopening communicating with said'chamber, the iioor of said chamber beingadapted to receive the overiow from said opening and form a shallow poolof oil suiiicient for the initial charge of the engine, the centralportion of said chamber above said iioor being open and unobstructed,the outer, upper walls oi said chamber having a series of air intakeopenings extending at intervals around said chamber, said walls alsohaving a circumerential duct communicating with said openings andoperating to direct the incomof air downwardl into the oil onsaid'iioor, the currents o air iowing downwardly from all sides andbeing deflected inwardly and upwardly by the lower walls of saidchamber, and meeting in the central unobstructed portion of saidchamber, whereby a uniform and thorough mixair will be obtained.

2. A carbureter comfrising a casing having a vaporizing cham er and anoil reservoir provided with an overflow opening communicating with saidchamber centrally through the bottom or floor thereof, a valve for saidoveriiow opening, the floor around said valve being adapted to contain ashallow pool of oil suliicient for the initial charge of the engine,said iioor being normally dry when the engine is in operation, saidvaporizing chamber having a series of air intake openings in its upperwalls extending around said chamber, the middle portion of said chamberbeing open and will be sub- Y inwardly intake opemngs in obstructed, aflange depending within said chamber near its outer walls and spacedtherefrom and forming with said outer walls a narrow circumferentialduct communlcating vat its. upper endwith said air inlet openings, thelower end of said duct leadin into said chamber near the door thereofand directing the currents of air into the ool of oil, the lower wallsof said chamer delecting the air currents upwardly and inwardly, saidcurrents meet-ing in the central' portion of said chamber and flowingfrom all sides of said chamber, whereby a uniform mixture will beobtained.

3. A carbureter comprising a casing having a vaporizing chamber and anoil reservoir provided with an overiow opening communicating with saidchamber, the overiiow from said opening accumulating on the floor ofsaid chamber when the engine. is at rest and forming a pool suicient forthe initial charge of the engine, the vaporization being suiiicientlyrapid when the-enginev is at work to prevent accumulation of the oil onthe floor of said chamber, said chamber having a series ofcircumferential. air its upper walls and a {iange depending within saidchamber to a point near the floor thereof, and spaced from the walls ofsaid chamber and forming ytherewith a narrow duct which communicates atits upper end with said airintake openings, t flange directing the aircurrents downwardly into 'the pool o.oil and deflecting them inwardlyand upwardly, saidV air currents entering said chamber from all sidesthereof, whereby a uniform mixture will be 4. A carbureter comprising acasing having a vaporizing chamber therein provided with a bottomadapted to contain a shallow Apool or film of oil and communicating witha source of oil supply, the walls of said casing having a series of airintakepassages tangentially arranged with respect to said walls, saidchamber having a circumferential duct communicating with said passages,tlie walls of said duct directing the air currents downwardly into thepool of oil in the bottom of said chamber whereby said air currents willbe uniformly and thoroughly carbureted.

In .witness whereof I have hereunto my hand this 11" day of J an. 1910.

CHARLES M. STROUD.

Witnesses:

L. C. CBONEN, A. M. W'ALs'rnoM.

set

he walls of said chamber and said

